I like the filmic look (I used it for my own edits), but I wouldn't say it adds detail. It adds noise, which might be perceived as fine detail.
I guess it'd be like adding some dirt to a slightly blurry photograph. Do a good enough job and it might not look like it is blurry. It's not because it's clearer; it just has a layer of highly detailed noise over top of it. A better example might be to apply sharpening to a blurry photo to make it look crisper.